KMS National Astronomical Observatories, CAS
| Weak CS emission in an extremely metal-poor galaxy DDO 70 | |
| Du, Kaiyi1,2; Shi, Yong1,2; Zhang, Zhi-Yu1,2; Wang, Junzhi3; Gao, Yu4,5 | |
| 2020-07-01 | |
| Source Publication | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| ISSN | 0035-8711 |
| Volume | 496Issue:1Pages:L38-L42 |
| Abstract | In most galaxies like the Milky Way, stars form in clouds of molecular gas. Unlike the CO emission that traces the bulk of molecular gas, the rotational transitions of HCN and CS molecules mainly probe the dense phase of molecular gas, which has a tight and almost linear relation with the far-infrared luminosity and star formation rate (SFR). However, it is unclear whether dense molecular gas exists at very low metallicity, and if exists, how it is related to star formation. In this work, we report ALMA observations of the CS J = 5 -> 4 emission line of DDO 70, a nearby gas-rich dwarf galaxy with similar to 7 per cent solar metallicity. We did not detect CS emission from all regions with strong CO emission. After stacking all CS spectra from CO-bright clumps, we find no more than a marginal detection of CS J = 5 -> 4 transition, at a signal-to-noise ratio of similar to 3.3. This 3 sigma upper limit deviates from the L'(CS)-L-IR and L'(CS)-SFR relationships found in local star-forming galaxies and dense clumps in the Milky Way, implying weaker CS emission at given infrared luminosity and SFR. We discuss the possible mechanisms that suppress CS emission at low metallicity. |
| Keyword | galaxies: dwarf galaxies: ISM submillimetre: ISM |
| Funding Organization | National Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences |
| DOI | 10.1093/mnrasl/slaa086 |
| WOS Keyword | STAR-FORMATION RATE ; MOLECULAR GAS ; CO EMISSION ; HCN ; LUMINOSITY ; REGIONS |
| Language | 英语 |
| Funding Project | National Key Research and Development Program of China[2017YFA0402704] ; National Key Research and Development Program of China[2018YFA0404502] ; NationalNatural Science Foundation of China (NSFC)[11825302] ; NationalNatural Science Foundation of China (NSFC)[11733002] ; NationalNatural Science Foundation of China (NSFC)[11773013] ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China[2017YFA0402704] ; National Natural Science Foundation of China[11861131007] ; National Natural Science Foundation of China[U1731237] ; National Natural Science Foundation of China[11420101002] ; Chinese Academy of Sciences Key Research Program of Frontier Sciences[QYZDJSSW-SLH008] |
| Funding Organization | National Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences |
| WOS Research Area | Astronomy & Astrophysics |
| WOS Subject | Astronomy & Astrophysics |
| WOS ID | WOS:000560791900008 |
| Publisher | OXFORD UNIV PRESS |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.bao.ac.cn/handle/114a11/82226 |
| Collection | 中国科学院国家天文台 |
| Corresponding Author | Shi, Yong; Zhang, Zhi-Yu |
| Affiliation | 1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China 2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210093, Peoples R China 3.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 4.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China 5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China |
| Recommended Citation GB/T 7714 | Du, Kaiyi,Shi, Yong,Zhang, Zhi-Yu,et al. Weak CS emission in an extremely metal-poor galaxy DDO 70[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,496(1):L38-L42. |
| APA | Du, Kaiyi,Shi, Yong,Zhang, Zhi-Yu,Wang, Junzhi,&Gao, Yu.(2020).Weak CS emission in an extremely metal-poor galaxy DDO 70.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,496(1),L38-L42. |
| MLA | Du, Kaiyi,et al."Weak CS emission in an extremely metal-poor galaxy DDO 70".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 496.1(2020):L38-L42. |
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